Not Ranked
The AN as you know uses 37 degrees and standard automotive flare is 45* and you should match to proper use. A 37* flare on a 45* fitting means a very thin contact area, much less than as designed. You do not want a failure after a few heat cycles or at a higher pressure down the line.
My best hint is pay close attention to amount of line left out of flare tool or the anvil end. The directions in your kit tell you too use the part that goes into the line as a depth gage, you leave amount of 1st lip out of anvil to make bend in proper location and material amount.
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